P24F6

What it means

On systems that inject HC dosing fuel or AIR-assisted reductant into the aftertreatment, a purge valve clears the line after each dosing event. The ECM detects the valve stuck open — pressure or flow does not build up against a closed valve, so the dosing line cannot be charged. Common on diesel HC-doser hardware (DPF regen support).

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Mechanically stuck open valve from soot or coking

  high

  One of the most commonly reported causes for this code — check this first.

• Broken return spring

  medium

  A plausible cause — test and verify before replacing parts.

• Carbon or debris buildup preventing free movement

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P24F6 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?